Office (OLE) / .DOC malware analysis — malicious · 2635a08702df0fbe

MALICIOUS

Office (OLE) / .DOC

49.5 KB Created: 2010-05-09 13:50:00 Authoring application: Microsoft Word 10.1

MD5: 262462bf66b71b1956fc54c1938a7574 SHA-1: 0cdd14fdba4ca61792dc426a2b669523f6d64583 SHA-256: 2635a08702df0fbea6bc754f7a972ae1f11aad375b58c3b3115f95693c50d4b3

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The sample contains a Document_Open macro that utilizes CreateObject, a common technique for executing malicious code. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common lure to bypass gateway security. The ClamAV detection 'Doc.Trojan.Melissa-4' and the presence of a VBA macro named 'macros.bas' further support a malicious classification. The macro's intent is likely to download and execute a second-stage payload from the archive.

Heuristics 7

ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY

OLE file is 50,688 bytes but its declared streams total only 24,182 bytes — 26,506 bytes (52%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
Document_Open macro high OLE_VBA_DOCOPEN

Document_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `d9b96e160d2fe61179057ebb96007cd4ea143b1f23dacc45a5bbb02fc859b67d`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	3743 bytes
Detection ClamAV: Doc.Trojan.Melissa-4 Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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